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An Asian firefighter wannabe is suing the FDNY over its physical exam, saying it discriminates against minorities — because their lungs aren’t as big as those of white people.

Rickey Lall, 32, who is of Indian ancestry and lives in The Bronx, claims in his Manhattan Supreme Court suit that he passed all the city Fire Department’s entrance exams in 2013 with flying colors except for a pulmonary-function test administered to detect lung disease.

Lall says the test’s metrics are unfair because studies show “there are differences in normal lung volumes among various ethnic or racial groups.’’

Blacks and Asians, for example, have a 12 percent lower volume, his suit states.

Lall says in the suit that he has long wanted to be a member of New York’s Bravest and even worked as a firefighter when he was in the US Navy.

“As a young child, I grew up two doors away from Ladder 38 and Engine 88 firehouse. I enjoyed watching the fire trucks going in and out as they responded to their calls,” Lall says in his suit.

“Hopefully, with the resources I provide, it will convince the FDNY I am fully capable to perform the duties of a New York City firefighter.”